Boost Addicted Posted April 7, 2004 Report Share Posted April 7, 2004 working??? Sometimes I only make 6psi other times 15. I replaced the stock BC with a new one and cleaned the connection, no change. Link to comment Share on other sites More sharing options...
EricF Posted April 7, 2004 Report Share Posted April 7, 2004 You would be spiking to 20ish if your w/g wasn't working. I've run with it's actuator hose disconnected purposely before Sounds like there might be a vacuum leak that doesn't always leak... Have you checked all the rubber elbows in your intake system?If you think it's your BCS (I've gotten bad ones new from Volvo before), then bypass it and use a manual boost controller sole-ly to control the boost level. It sounds to me like a vacuum leak, but it's hard to say.... Link to comment Share on other sites More sharing options...
Boost Addicted Posted April 7, 2004 Author Report Share Posted April 7, 2004 Went from a 2 week old bcs to a brand new one. Unless they got a bad lot of them I guess I'll try and take it out of the loop. Link to comment Share on other sites More sharing options...
Boost Addicted Posted April 7, 2004 Author Report Share Posted April 7, 2004 Notice someting else, really wierd. Everytime I plug in my laptop cable into the OBD2 port the prob goes away within about 10 sec. Stays away for a hour or 2 and them comes back. Could it be a ground issue? Link to comment Share on other sites More sharing options...
Sasso 99 C70 T5 Posted April 7, 2004 Report Share Posted April 7, 2004 If the stock BCS were to fail in any way you would definately get an engine light because of it. Link to comment Share on other sites More sharing options...
jb7073 Posted April 7, 2004 Report Share Posted April 7, 2004 If the stock BCS were to fail in any way you would definately get an engine light because of it.Actually it might not.Mine isn't connected to anything since I have an MBC. As long as the wire is plugged it, that's all it cares about. Link to comment Share on other sites More sharing options...
Chopper Posted April 7, 2004 Report Share Posted April 7, 2004 What are the operating conditions? Different temperatures? Fuels? Link to comment Share on other sites More sharing options...
Bill at Adrenaline Racing Posted April 7, 2004 Report Share Posted April 7, 2004 I have run 25psi on the stock BCS. I cracked vacuum elbow or rubber line tha only leaks sometimes due to weather, vibration etc will show this exact symptom. all 3 of my 850's have had bad lines at one time or another. 94,95,97. They just rot away. Link to comment Share on other sites More sharing options...
Chopper Posted April 7, 2004 Report Share Posted April 7, 2004 Rubber lines just can't last forever. When they're 8-10 years old and have a bunch of heat cycles on them, they just die. If you're worried about vaccum leaks, just replace all your lines with new ones, silicon if you don't want to do it again for a while. It will not cost much, and is a relatively short proceedure minus a couple of hard to reach connections. Link to comment Share on other sites More sharing options...
Boost Addicted Posted April 7, 2004 Author Report Share Posted April 7, 2004 Temps have been the same, using the same gass 93.5 octane. Checked and replaced with sicicon every hose (checked bay 13 also for locations.) I don't think it is a boost leak because if, while it is acting up, if I unplug the stock BCS it runs exactly the same as when it was pluged in> Link to comment Share on other sites More sharing options...
Chopper Posted April 7, 2004 Report Share Posted April 7, 2004 Unless you have a crack in an intercooler pipe or somewhere along there. Personally I want to blame this on the Volvo's computer. Link to comment Share on other sites More sharing options...
Boost Addicted Posted April 8, 2004 Author Report Share Posted April 8, 2004 New info:My piping and intercooler are new, no change before them and after.Pluging in the cable didn't work this time. Disconnected the stock bcs and put a bleed in the line from the turbo presure source to the WG. Boost rose only 2 pounds and this is a large bleed, like 50%. Could my Bov be leeking? Or could the WG be stuck partly open? I adusted it a million times, could I have jacked it up?Update: Unpluged the WG line boost went up to 15psi and I let off.Also my TPS is reading only 87.5% even though I am flooring the car. Haven't taken a reading when the car is running right. Link to comment Share on other sites More sharing options...
Guest Guest_volflo Posted April 8, 2004 Report Share Posted April 8, 2004 hey pete.since my car is back on the road for one week now, i have tested my times (80-180, 100-200, 60-100, 80-180 only forth) like last year.along with the UR puley i also removed whole ac System (incl ac cooler so intercooler is in front now free breathing) , belt is now ~20 inch shorter than before)car runs like hell now: from 100k to 200k i gained an unbelievable 2.5 secs. now my car jumps from 100 to 200k using 3 and 4th gear in.....10,7 SECS two people in the car. (three times under 11 secs)80-180 in only 4th 10.8 secs.60-100 2.8, 2.980-180 3rd 4 th gear 9.7 secsim quite satisfied. GREAT JOB PETE.but i think i have to adjust my wastegat now. How come that the pressure seems to have increased slightly? Anyone know? Link to comment Share on other sites More sharing options...
Chopper Posted April 8, 2004 Report Share Posted April 8, 2004 87.5% is the widest I have ever seen my TB open as well. I suspect that is the most the 850 TB will open, or that the comptuer just dosn't bother to register and value over this. It could be a power retardation feature, or a "saftey" feature (although I don't know why), but I can imagine it.Maybe your wastegate is too weak, but I saw no difference in bleed on a 15g between the stock 185/65 wastegate and a 300/70 wastegate. Both bled off pretty evenly.There was at one point a lot of dicussion about this, a lot of people had their Volvo with a chip/exhaust or just chip who would boost to 15psi, but bleed off to 10-12 psi. I honestly just think it's the Volvo and the turbo's flow rate. Sure it works without your wastegate, but that eliminates the comptuer control over boost bypass and then wastegate itself, either of which could be the culprit. Could have some other effects I am forgetting to mention at the moment.Edit: It may be a stupid question, but how is your compression? Link to comment Share on other sites More sharing options...
Boost Addicted Posted April 8, 2004 Author Report Share Posted April 8, 2004 Have a brand new 19T came with the larger wastegate. Compression was good, checked it 7K miles ago. Link to comment Share on other sites More sharing options...
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